Summary of Changes to Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended				9 Months Ended
	Jun. 30, 2013	Jun. 30, 2013 Applications	Jun. 30, 2013 Scores	Sep. 30, 2012 Scores	Jun. 30, 2013 Tools
Goodwill [Line Items]
Beginning Balance	$ 757,504	$ 542,943	$ 146,648	$ 146,648	$ 67,913
Addition from acquisitions	17,457	17,457
Foreign currency translation adjustment	(9,374)	(7,848)			(1,526)
Ending Balance	$ 765,587	$ 552,552	$ 146,648	$ 146,648	$ 66,387